ok here is clue:
An OLED display thus emits its own light. LCDs require a separate backlight. The image you see on your LCD is created when thousands of transistors open an aperture in a matrix of liquid crystals, allowing the backlight to shine through, like a window blind. That's the reason you have to face an LCD straight on to see it well, and why you can't see it well outside.
Because they're emissive rather than transmissive, OLEDs are sharper and brighter than LCDs. For this same reason, you can clearly see them even if you're peering at them from one side or the other. And that visual superiority isn't their only virtue. OLEDs are also:
Thinner and lighter. With no backlight and fewer layers of glass, OLEDs are little thicker than a dime--about a third the thickness of an LCD.
Better for video. Because OLEDs refresh about 1 million times a second--as much as 1,000 times faster than some LCDs--moving images are much crisper.
Kimberly Allen, a market researcher with iSuppli/Stanford Resources that follows display technologies, isn't. But she's bullish on OLEDs, too, characterizing them as the "biggest up-and-coming player" among several emanating display technologies. Her firm predicts that the market for OLEDs could reach $2.3 billion by 2008.
http://www.siliconinvestor.com/readmsg.aspx?msgid=18250758
shortly: next TV technology after plasma and lcd